Exchange 5.5 to Exchange 2010 – Is such a thing even possible?

Haven’t been able to get any updates posted for a little while now, been busy with that whole day job thing. I know promised more Lync tools, they’re coming and soon I hope. If I can scratch out the time to put the finishing touches on them and do the finalized testing; I’d like to get the Topology Documenter and Topology Mapper posted by this weekend. I’ve had other things on my plate and figure it might make an interesting post. So… onto other things.

Officially, there is no Microsoft supported migration from Exchange 5.5 to Exchange 2010. The oldest supported environment you can upgrade to Exchange 2010 is Exchange 2003. So that normally leaves you with a two step method, 5.5 to 2003 and then 2003 to 2010. And if you’re lucky, Exchange 5.5 will be running on Server 2000 so you at least get Active Directory to make the process easier. No such luck for me. Mine was Exchange 5.5 on NT 4.0 to Exchange 2010 SP1 on Server 2008 R2 SP1. I know what you’re thinking, “Sounds like fun!” Luckily we were moving from one NT domain, OldDom, to another 2003 AD domain, NewDom, so that made it a little easier.

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